I've had many writing friends and colleagues try to use
An editor I hired tried to convince me to map out my story into 3 acts. Margo Dill gave me some specific suggestions for each act. I now have to admit: Margo, I did all my "planning" in my head as I went. I hope you'll agree that in this case, pantsing worked. (Margo has my manuscript and since we're snowed in today, perhaps she's reading it right now.)
However, it's a miracle! I'm embracing planning. Finally. I just finished Jessica Brody's book Save the Cat! Writes a Novel and it's transforming. I'm already thinking about how I can make my story map (with index cards and corkboard) portable, since I'll be going to a writing retreat in February.
If you check out my post at The Muffin you can find out some details about this book.
(A book that can change Sioux from a pantser into a planner? That book must have some powerful mojo...)